Rehabilitation of patient with unilateral congenital anophthalmia using custom ocular prosthesis

Procedure

Patients anophthalmic socket was irrigated with saline followed by light lubrication with lubricant. A semi customized impression tray was made with an addition silicone light body applicator tip (Avue gum light body, Dental Avenue, India) and plastic spoon. (Figure 2) The light body was expressed into the anophthalmic cavity and the patient was instructed to close the eyelids and perform various eye movements. (Figure 3)

After setting, the primary impression was removed and inspected for any voids. Boxing was done with modelling wax. The impression was poured till the convexity or height of contour of the ocular defect with type III dental stone (Kalrock; Kalabhai Karson, India) to obtain a primary cast. The cast was retrieved and evaluated for any errors.

Custom tray was fabricated with self-cure acrylic resin. (Figure 4)(DPI self-cure tooth molding powder, Mumbai) The final impression was made using light body in a similar manner.(Figure 5) The final impression was removed and checked for any error. This was followed by beading and boxing. A final cast was poured to obtain a split cast. Wax pattern was made to duplicate the contour of the contralateral eye. Patient was instructed to perform various eye movements to check the fit and comfort. A putty index of wax pattern was made using condensation silicone. (Zeta Plus, Zhermack, Italy)

A conformer was fabricated using putty index of wax pattern with clear acrylic to increase the size of the shrunken anophthalmic socket. (Figure 6) Using the conformer the soft tissue profile of the eyelids were adequately matched. Patient was instructed to use this conformer until the size of anophthalmic cavity is increased. The wax pattern was repeated according to the increased size of anophthalmic cavity. Stock iris was selected to match the size and color of patients contralateral iris.

Iris centering was done by marking points on the patient's face: the facial midline, the center of the iris of the opposite eye, and a third point at the same distance from the midline as the iris center. (Figure 7) These marks were transferred to the wax pattern and final cast, then the iris was positioned in the patient's anophthalmic cavity. The centered iris was evaluated using a digital graph on a frontal facial photograph. (Figure 8)

Figure 1

Patient has unilateral anophthalmia with right eye

Figure 2

Semicustomized impression tray

Figure 3

Recording of primary impression

Figure 4

Custom tray on primary cast

Figure 5

Final impression

Figure 6

Conformer

Figure 7

Centering of iris

Figure 8

Digital verification of centered iris

Figure 9

Scleral shade selection using customized shade guide

Figure 10

Delivery of custom ocular prosthesis

Patients scleral shade was selected using customized shade guide created with tooth colored heat cure acrylic resin. (Figure 9) The iris was stabilized with plastic cap of gas torch and adhesive. Flasking was done followed by dewaxing, packing and processing with tooth colored heat cure acrylic resin. (DPI heat-cure tooth molding powder, Mumbai)

The prosthesis was retrieved followed by characterization with acrylic colors to match the patients contralateral eye. A thin layer of spacer wax was adapted on this ocular prosthesis and flasking, dewaxing, and processing was done with heat cure clear acrylic resin. The final custom ocular prosthesis was retrieved followed by finishing and polishing. This final prosthesis was delivered to the patient and evaluated critically for lid drape, contour, and dimension. The follow-up was done after a week.

Use of conformers

One standout feature in this case is the strategic use of a conformer to address a shrunken anophthalmic cavity. By gradually increasing the cavity size, the conformer ensures better adaptation of the final prosthesis to the socket. This approach is not universally applied but has demonstrated its effectiveness in enhancing both comfort and aesthetic outcomes for patients. The gradual resizing facilitated by the conformer is crucial for achieving a precise fit, a fundamental factor in the success of ocular prostheses. 9

Custom tray fabrication

The fabrication of the custom tray using self-cure acrylic resin provided a highly detailed and accurate final impression, essential for producing a well-fitting prosthesis. While this step may be routine, its critical role in ensuring an optimal fit is often underappreciated. Emphasizing the precision of the custom tray fabrication process can significantly improve prosthetic outcomes. 10

Digital evaluation for iris centering

A particularly noteworthy innovation in this case is the use of digital evaluation for iris centering. By leveraging facial landmarks, this method achieves precise alignment of the prosthetic eye’s iris with the contralateral eye. This digital approach represents a significant advancement over traditional methods, offering increased precision and better aesthetic outcomes, which in turn enhances patient confidence and satisfaction. 11

Customized shade guide

The creation of a customized shade guide using tooth-colored acrylic resin to match the scleral color is another unique aspect. This approach ensures that the prosthesis closely matches the patient’s natural eye color, contributing to a more natural and aesthetically pleasing appearance. Such customization plays a crucial role in patient satisfaction.

Advanced final processing techniques

The final processing steps, including detailed characterization with acrylic colors and the addition of a clear acrylic resin layer for a smooth finish, further distinguish this case. These advanced techniques ensure the durability and aesthetic appeal of the prosthesis, closely mimicking the contralateral eye. Emphasizing these detailed final processing steps can significantly enhance the overall quality of the prosthetic outcome. ⁷